Your problem sounds like something entirely different then
The common - Dolphin does not update file displays - bug is (to parapharse)
Folder has 20 files in it, you download a couple of tar balls, untar them in a terminal, or right-click extract. Dolphin still reports 20 files. Usually F5 works, sometimes you need to open a new tab (old tab is dead
close it) or close and restart Dolphin ------ But not the PC!!
What your are reporting appears to be either a device error/problem or file system problem/error (NTFS).
(as it appears your are using a drive formatted to NTFS), there is a slight delay between the actual writing process (needs to go through fuse, and then ntfs-3g or the kernel ntfs module).
Try passing the sync command.
Is the situation the same when you attempt the operations on a Linux native file system?